/*
 * Copyright 2019 Yoram Halberstam (yoram dot halberstam at gmail dot com)
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package me.yoram.webapp.decoder.protobuf.api.decoder.impl;

import me.yoram.webapp.decoder.protobuf.api.decoder.api.DecoderApi;
import org.apache.commons.io.IOUtils;

import java.io.File;

/**
 * @author Yoram Halberstam (yoram dot halberstam at gmail dot com)
 * @since 24/12/2019
 */
public class CommandLineDecoder implements DecoderApi {
    @Override
    public byte[] decode(final File protofile, final String type, final byte[] bin) throws Exception {
        Process p = null;
        try {
            p = new ProcessBuilder(
                    "/bin/bash",
                    "-c",
                    String.format(
                            "protoc --proto_path '%s' --decode %s '%s'",
                            protofile.getParentFile().getAbsolutePath(), type, protofile.getAbsolutePath()))
                    .start();

            try (var out = p.getOutputStream()) {
                out.write(bin);
            }

            try (var in = p.getInputStream()) {
                return IOUtils.toByteArray(in);
            }
        } catch (Exception e) {
            if (p == null) {
                throw e;
            } else {
                throw new Exception(String.format("Exit code %d", p.exitValue()), e);
            }
        }
    }
}
